Water pressure test device for bushing shaft

Abstract

The utility model relates to a bushing shaft hydraulic pressure test device, which comprises a sealing sleeve, a sealing cavity communicated with the external environment is arranged in the sealing sleeve, and a test cavity communicated with the sealing cavity is arranged in the sealing sleeve. The end portion of the sealing sleeve is provided with a through hole communicated with the testing cavity, and a compression nut is installed at the end portion of the sealing sleeve and located at one end of the through hole, the front end of the rotating shaft and the bushing portion of the rotating shaft are sealed through cooperation of the compression nut and the sealing sleeve, the sealing performance is good, dismounting and mounting are convenient, and the sealing performance is good. And meanwhile, the hydraulic test of the bushing shaft with internal and external threads can be completed, and the operation is simple.

Description

Technical Field

[0001] This utility model relates to the field of water pressure testing technology, and in particular to a bushing shaft water pressure testing device. Background Technology

[0002] The bushing is made by heat-fitting a circular seamless stainless steel tube into the shaft extension. To ensure that the inner diameter of the seamless steel tube fits perfectly with the outer diameter of the shaft, a hydrostatic test is required at the shaft extension after heat fitting. The hydrostatic test involves placing the bushing part of the shaft in a sealed environment and applying pressure to determine whether the bushing part fits tightly and without leakage. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a bushing-mounted shaft hydrostatic testing device, the specific technical solution of which is as follows:

[0004] A hydraulic pressure testing device for a bushing shaft includes a sealing sleeve with a sealed cavity communicating with the external environment inside. A test cavity communicating with the sealed cavity is also provided inside the sealing sleeve. A through hole communicating with the test cavity is provided at the end of the sealing sleeve. A clamping nut is installed at the end of the sealing sleeve located at the through hole. The end face of the clamping nut mates with the end face of the sealing sleeve to form a sealing area for the front end of the shaft. The inner wall of the sealing cavity mates with the circumferential surface of the bushing portion of the shaft to form a sealing area. A water inlet valve communicating with the test cavity is provided at the top of the sealing sleeve, and a water outlet valve communicating with the test cavity is provided at the bottom of the sealing sleeve.

[0005] As an improvement to the above technical solution, a second sealing groove is provided on the inner wall of the sealed cavity, and a matching O-ring is provided in the second sealing groove.

[0006] As an improvement to the above technical solution, the clamping nut is provided with an internal thread that matches the external thread of the rotating shaft.

[0007] As an improvement to the above technical solution, the end of the clamping nut is provided with an annular sealing groove, and an O-ring is provided in the sealing groove.

[0008] As an improvement to the above technical solution, a screw is integrally formed inside the clamping nut, the screw is adapted to the thread inside the rotating shaft, and a gasket is provided between the end face of the clamping nut and the end face of the sealing sleeve.

[0009] The beneficial effects of this utility model are:

[0010] By tightening the nut and sealing sleeve, the front end of the shaft and the bushing part of the shaft are sealed. The sealing performance is good, and it is easy to disassemble and assemble. It can be reused. At the same time, it can perform hydrostatic tests on the bushing shaft with internal and external threads. The operation is simple. Attached Figure Description

[0011] Figure 1 This is a front view of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0013] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0014] Figure 4 This is a schematic diagram of the structure of the clamping nut of this utility model.

[0015] Reference numerals in the attached drawings: 1. Compression nut; 11. Internal thread; 12. Sealing groove one; 13. O-ring one; 14. Screw; 2. Shaft; 3. Sealing sleeve; 31. Through hole; 32. Test chamber; 33. Sealing chamber; 34. Sealing groove two; 4. Inlet valve; 5. Sleeve part; 6. Outlet valve; 7. O-ring two. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Example 1

[0018] A hydraulic pressure testing device for a bushing shaft includes a sealing sleeve 3. The sealing sleeve 3 has a sealed cavity 33 communicating with the external environment. The sealing sleeve 3 also has a test cavity 32 communicating with the sealed cavity 33. The end of the sealing sleeve 3 has a through hole 31 communicating with the test cavity 32. A clamping nut 1 is installed at the end of the sealing sleeve 3, located at the end of the through hole 31. The end face of the clamping nut 1 mates with the end face of the sealing sleeve 3 to form a sealing area for the front end of the rotating shaft 2. The inner wall of the sealing cavity 33 mates with the circumferential surface of the bushing portion 5 of the rotating shaft 2 to form a sealing area. A water inlet valve 4 communicating with the test cavity 32 is connected to the top of the sealing sleeve 3, and a water outlet valve 6 communicating with the test cavity 32 is connected to the bottom of the sealing sleeve 3.

[0019] The inner wall of the sealing cavity 33 is provided with a sealing groove 34, and a matching O-ring 7 is provided in the sealing groove 34. The clamping nut 1 is provided with an internal thread 11 that matches the external thread of the rotating shaft 2. The end of the clamping nut 1 is provided with an annular sealing groove 12, and an O-ring 13 is provided in the sealing groove 12.

[0020] When the rotating shaft 2 has an external thread, the position on the rotating shaft 2 where the stainless steel sleeve is fitted is the insert part 5. First, install the O-ring 2 7 into the sealing sleeve 3, and then fit the sealing sleeve 3 with the O-ring 2 7 onto the rotating shaft 2 with the steel sleeve. The through hole 31 of the sealing sleeve 3 and the step of the rotating shaft 2 cooperate to form a positioning. Then, screw the clamping nut 1 with the O-ring 13 into the appropriate position along the external thread of the rotating shaft 2. Stop screwing in when the O-ring 13 is sealed by the pressure between the bottom of the clamping nut 1 and the end face of the sealing sleeve 3. At this time, open the water inlet valve 4 and observe the water pressure gauge. When the water pressure gauge value reaches the test requirement value, close the water inlet valve 4. At this time, the device should be in a completely sealed state, and the water pressure gauge value should remain unchanged. Finally, observe the exposed end face of the stainless steel sleeve. If there is no leakage after continuous pressure maintenance for 5 minutes, it is considered qualified. After the test, open the water outlet valve 6 to release the water, then unscrew the clamping nut 1, and finally remove the sealing sleeve 3.

[0021] Example 2

[0022] A hydraulic pressure testing device for a bushing shaft includes a sealing sleeve 3. The sealing sleeve 3 has a sealed cavity 33 communicating with the external environment. The sealing sleeve 3 also has a test cavity 32 communicating with the sealed cavity 33. The end of the sealing sleeve 3 has a through hole 31 communicating with the test cavity 32. A clamping nut 1 is installed at the end of the sealing sleeve 3, located at the end of the through hole 31. The end face of the clamping nut 1 mates with the end face of the sealing sleeve 3 to form a sealing area for the front end of the rotating shaft 2. The inner wall of the sealing cavity 33 mates with the circumferential surface of the bushing portion 5 of the rotating shaft 2 to form a sealing area. A water inlet valve 4 communicating with the test cavity 32 is connected to the top of the sealing sleeve 3, and a water outlet valve 6 communicating with the test cavity 32 is connected to the bottom of the sealing sleeve 3.

[0023] The inner wall of the sealing cavity 33 is provided with a sealing groove 34, and a matching O-ring 7 is provided in the sealing groove 34. A screw 14 is integrally formed inside the clamping nut 1. The screw 14 is matched with the thread inside the rotating shaft 2. A gasket is provided between the end face of the clamping nut 1 and the end face of the sealing sleeve 3.

[0024] When the rotating shaft 2 has an internal thread, the position on the rotating shaft 2 where the stainless steel sleeve is fitted is the insert part 5. First, install the O-ring 2 7 into the sealing sleeve 3, then fit the sealing sleeve 3 with the O-ring 2 7 onto the rotating shaft 2 with the steel sleeve. The through hole 31 of the sealing sleeve 3 and the step of the rotating shaft 2 form a positioning. Rotate the screw 14 into the rotating shaft 2 by tightening the nut 1. Stop tightening when the tightening nut 1 forms a seal with the sealing sleeve 3 through the pressure of the gasket. At this time, open the water inlet valve 4 and observe the water pressure gauge. When the water pressure gauge value reaches the test requirement value, close the water inlet valve 4. At this time, the device should be in a completely sealed state, and the water pressure gauge value should remain unchanged. Finally, observe the exposed stainless steel sleeve end face. If there is no leakage after continuous pressure maintenance for 5 minutes, it is considered qualified. After the test, open the water outlet valve 6 to release the water, then unscrew the tightening nut 1, and finally remove the sealing sleeve 3.

[0025] This device is flexible in use and can be applied to hydrostatic tests of sleeved shafts with both internal and external threads by changing different clamping nuts 1 and sealing sleeves 3. The device has a simple structure and is not easily damaged.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bushing shaft hydrostatic testing device, characterized in that, The device includes a sealing sleeve (3), which has a sealing cavity (33) that communicates with the external environment. The sealing sleeve (3) has a test cavity (32) that communicates with the sealing cavity (33). The end of the sealing sleeve (3) has a through hole (31) that communicates with the test cavity (32). A clamping nut (1) is installed at the end of the sealing sleeve (3) and at the end of the through hole (31). The end face of the clamping nut (1) and the end face of the sealing sleeve (3) cooperate to form a sealing area for the front end of the rotating shaft (2). The inner wall of the sealing cavity (33) cooperates with the circumferential surface of the bushing part (5) of the rotating shaft (2) to form a sealing area. The top of the sealing sleeve (3) is connected to an inlet valve (4) that communicates with the test cavity (32). The bottom of the sealing sleeve (3) is connected to an outlet valve (6) that communicates with the test cavity (32).

2. The bushing shaft hydrostatic testing device according to claim 1, characterized in that: The inner wall of the sealed cavity (33) is provided with a sealing groove (34), and a matching O-ring (7) is provided in the sealing groove (34).

3. The bushing shaft hydrostatic testing device according to claim 1, characterized in that: The clamping nut (1) is provided with an internal thread (11) that is compatible with the external thread of the rotating shaft (2).

4. The bushing shaft hydrostatic testing device according to claim 3, characterized in that: The end of the clamping nut (1) is provided with an annular sealing groove (12), and an O-ring (13) is provided in the sealing groove (12).

5. The bushing shaft hydrostatic testing device according to claim 1, characterized in that: The tightening nut (1) has an integrally formed screw (14) inside, the screw (14) is adapted to the thread inside the rotating shaft (2), and a gasket is provided between the end face of the tightening nut (1) and the end face of the sealing sleeve (3).

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